1911 Encyclopædia Britannica, Volume 7… (1911)
“ Scotland was filled with rumours of plot and assassination, and civil war was only narrowly avoided. Unable to take any serious part in affairs of state, Darnley soon became estranged from his wife. He believed that Mary’s relations with David Rizzio injured him as a husband, and was easily persuaded to assent to the murder of the Italian, a crime in which he took part. Immediately afterwards, however, flattered and cajoled by the queen, he betrayed his associates to her, and assisted her to escape from Holyrood to Dunbar. ”
